"Open Educational Resources (OERs) offer unique opportunities to enhance the quality of education and ensure equitable access to learning resources. A major concern, however, is the quality of OERs. This article presents a generic conceptual framework for the Quality Assurance (QA) of OERs based on Quality Seals and introduces the Photodentro Quality Seals (QS) Repository and e-service (photodentro.edu.gr/seals), which was initiated and developed to support the quality assurance processes of the Greek national digital OER repositories for primary and secondary education. The proposed QA framework is based on three main entities: Quality Seals (describing either a set of quality criteria, a well-defined quality assurance procedure, or a reliable source of origin); Quality Seal holders (e.g., OER certifiers); and Sealings (representing e.g. certificates for OERs). The Photodentro QS repository hosts and manages Quality Seals and Sealings for OERs, which reside on various OER repositories, and provides a registry of OER certifiers. Our experiences from its nationwide use are also discussed."

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The "Photodentro SaaS" initiative drives the expansion of the Photodentro ecosystem of Open Educational Resource (OER) repositories. The initiative is based on the "Software as a Service" model (SaaS), allowing for all interested organisations to implement a Photodentro repository to manage, describe, and publish their digital artefacts. The benefits are twofold: (i) the new content provider gains exclusive access to a standards-based digital repository, integrating the best practices and workflows specifically designed to meet the needs of OER for K12 education; (ii) being part of the Photodentro ecosystem, all resources of the new repository are readily available and profit of high visibility through the web portal of the Photodentro Greek National Educational Content Aggregator.